Fix checkstyle warnings in netconf-util

Change-Id: I0fbe00cc76f3b84a8b2673f1716b8ceb08c2b52b
Signed-off-by: Marian Dubai <mdubai@cisco.com>
BUG-8: migrate newMBeanProxy() -> newMXBeanProxy()

newMBeanProxy() is deprecated, so migrate users over, eliminating
associated warnings.

Change-Id: Ifd9ff1146f2f0e5b2a20a55bd8c34f48f837cb01
Signed-off-by: Robert Varga <rovarga@cisco.com>
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Merge "BUG-8: migrate newMBeanProxy() -> newMXBeanProxy()"
Merge "Fix checkstyle warnings in netconf-util"